速報
モノアミノシクロデキストリンからなるポリロタキサンで架橋したポリウレタンエラストマーの合成と物性評価
2022 年 95 巻 1 号 p. 1-7
詳細
2022 年 95 巻 1 号 p. 1-7
A polyurethane (PU) crosslinked by a polyrotaxane (PRX), which consists of monoamino-α-cyclodextrin(amCyD) and poly(ethylene glycol)4000 (PEG4000), was designed to decrease the formation of multiple crosslinks from one CyD. The capping reaction of the pseudo-PRX containing amCyD was achieved by a click reaction. The filling ratio of amCyD in the PRX was ca. 74%. The PU crosslinked by the PRX(PU-PRXam(74)) was prepared by a prepolymer method. The thermal and physical properties of PU-PRXam(74) were compared with those of the PUs crosslinked by PRXs consisting of half-methylated CyD(PU-PRXMe(43) and PU-PRXMe(63)). The degree of swelling of PU-PRX-am(74) was ca. 1.3 times larger than those of PU-PRXMes, suggesting the decrease in the multiple crosslinks from one CyD. The DSC and dynamic viscoelastic measurements revealed that PU-PRXam(74) shows a unique relaxation after its glass transition. In the tensile test results, PU-PRXam(74) showed the best elongation among the PU-PRXs whereas the tensile strength was lower than the others. This result is also evidence of the decrease in the multiple crosslinks from one CyD.
